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Project Information Sheet
Acorn Trail Realignment
Arastradero Preserve (Palo Alto, CA)
Spring 2001
Background
The trails in Arastradero Preserve receive heavy
use from all visitors during every season. Due to the
heavy clay soils and drainage patterns, many of the
trails are especially vulnerable to damage and
require frequent maintenance. Typical problems
include ponding and ruts due to lack of proper
drainage, berms on the outside of trails and lack of
tread definition. The Acorn Trail is no exception,
with soil problems compounded by poor layout.
Trail Center
volunteers rerouted several hundred feet of the
Perimeter Trail in 1998, closed a volunteer trail and
repaired erosion damage. In 1999, we repaired 600 ft.
of the Perimeter Trail between Portola Stables and
Gate B. [See the
description and schedule for the project] and in
2000, we rerouted one segment of Acorn Trail and
constructed 1400 feet of new trail.
An aerial photo and topographical map of the
project, including trail names are available. The City of Palo Alto's site
includes a map of the preserve. You may also wish to
see a MapQuest map of the Preserve
and surrounding area.
Project Description:
Acorn Trail (March 10, Apr. 22, May 12
and June 2): We will realign the
southwest section of the Acorn Trail between
Meadowlark (at the old barn site) and Corte Madera
Trails (near John Sobey Pond). The existing trail is
an extremely steep section vulnerable to erosion and
very difficult to traverse even under dry
conditions., particularly at the bottom. The grade on
the lower half is 13-20%. The reroute will move this
segment to the east and north; the junction with
Corte Madera Trail will be shifted a slightly
downhill. The new alignment will create one of the
Preserve's few wooded trails.
Detailed Description:
The new alignment uses the approximately 350 feet of
existing Acorn Trail from the Meadowlark Trail
junction at the old barn site down to the large oak
tree and teasel control area. The trail curves
sharply back to the left and drops off the ridge,
heading toward a switchback at the drainage. The
trail turns down the drainage through a series of
four additional switchbacks and meets Corte Madera
Trail a few feet to the north (downhill) of the
present junction. Most of the new trail will be in
oak woods.
Following completion
of the reroute, the old trail will be closed and
restored to natural conditions. The new trail will be
closed to all users during the winter of 2001/2002 to
prevent erosion. Due to the soil conditions, the
trail is not expected to be open to horses and
bicyclists during wet conditions.
Technical Specifications:
- Trail Width: 3.5-4 ft.
- Maximum Grade: 10% for new
construction; existing grade for maintenance
- Outslope: 2-3% (standard)
- Flagging: At grade level
(consult crew leader)
- Hazards and Other
Considerations: poison oak, wasps
(possible), ticks.
- Total Distance: Approx. 1400
ft.
- Structures required: Possible
reinforcements on switchbacks
- Expected Number of Workdays:
2
- Access to Worksite and
Parking: Parking at Preserve main lot,
along Arastradero Rd. near Page Mill intersection,
Page Mill Park & Ride
- Water, Restrooms, Picnic Area:
Water and restrooms at main lot (or as arranged);
picnic area to be announced at workday
- Emergency:
911 from phone at main lot or by cell
phone
-
Nearest
Hospital: Stanford Hospital. From
Arastradero Rd., go to Page Mill Rd., turn left
and go to I-280 entrance. Take I-280 2 mi. north
to Alpine Rd. exit; go right on Alpine and travel
2 mi. to Sand Hill Rd. Turn right and travel 1.5
mi. Stanford Hospital entrance and follow signs
to Emergency.
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Trail Center. All rights
reserved.
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Manager for corrections or comments.
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